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Bug 609063 diagnostic: check for concurrent slots realloc, r=dvander, a=beta8+

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This commit is contained in:
David Mandelin 2010-11-08 14:12:35 -08:00
parent f50fdd538d
commit 9894ece070
1 changed files with 7 additions and 0 deletions
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7
js/src/jsobj.cpp
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@ -3763,9 +3763,16 @@ JSObject::growSlots(JSContext *cx, size_t newcap)
if (!hasSlotsArray())
return allocSlots(cx, actualCapacity);
Value *oldslots = slots;
Value *tmpslots = (Value*) cx->realloc(slots, actualCapacity * sizeof(Value));
if (!tmpslots)
return false; /* Leave dslots as its old size. */
// If slots has changed, that means some other thread changed it while we
// were realloc'ing, which is very bad.
#define JS_CRASH(addr) *(int *) addr = 0;
if (oldslots != slots)
JS_CRASH(0xf0);
#undef JS_CRASH
slots = tmpslots;
capacity = actualCapacity;